World Clock
Live clocks for major zones with DST labels (device time, no server).
World clock, date calculators and timers
World clock, time-zone converter, date and business-day calculators, Unix timestamps, countdowns, Pomodoro and interval timers.
FreeFastPrivateNo signupRuns in your browser
Time
Time Zone Converter
Convert a local time across zones with explicit offset rules.
Meeting Planner
Overlap table for 4 zones at a glance.
Time Difference Calculator
HH:MM → duration with overnight support.
Add Hours & Minutes
Sum durations with carry rules.
Jet-lag / Travel Planner
Arrival times across zones for a flight.
Shift Hours Calculator
Net hours minus breaks, weekly total.
Date
Days Between Dates
Exact day count with leap-year-safe math (UTC noon).
Age Calculator
Years/months/days + next birthday + day of week born.
Business Days Calculator
Mon–Fri count excluding optional holidays.
Add / Subtract Days
Target date ± N days with weekday.
Week Number & Day of Week
ISO week, weekday, leap-year flag.
Quarter / Fiscal Helpers
Quarter, days left in year, DST note.
Leap Year Checker
Gregorian rule with next leaps list.
Day-of-Year Calculator
Ordinal day + remaining + ISO week.
Timestamp
Unix Timestamp Converter
Epoch ⇄ ISO ⇄ UTC string, ms/s aware.
ISO 8601 Converter
Parse/format ISO with timezone transparency.
Duration Formatter
Seconds → d/h/m/s human string.
2038 & Limits Checker
32-bit overflow, min/max safe dates.
Timers
Countdown Timer
Shareable ?tool=countdown link, presets, sound + keyboard.
Stopwatch
Laps, keyboard (Space/Enter), no drift display.
Pomodoro Timer
25/5 cycles with long breaks + session log (local).
HIIT / Tabata Timer
Work/rest rounds with phases and beeps.
Cooking Timer
Presets (eggs/pasta/rice) + custom, loud end.
Study Timer
Countdown with session history (local only).
Chess Clock
Two-player increment-capable clock.
Classroom Timer
Big display, fullscreen-friendly, pause-safe.
Custom Interval Builder
JSON-defined phases → runnable sequence.
Deadline Tracker
Days/hours left with progress bar (local).
Everyday
Sleep Cycle Calculator
Bedtimes/wake times in 90-min cycles.
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Why TimeGrid?
Use time-zone, date, and timer utilities in the browser. Check daylight-saving and locale assumptions for your situation.
Processed locally in your device. Your file is not uploaded.
FAQ
Is it free?
Yes — every tool is free with no signup and no credits.
Is my data uploaded?
Selected files are processed in your browser and are not sent to a Tolari processing endpoint. Configured third-party scripts or resources may still load.
Does it work offline?
The app shell and deterministic tools can work after they are cached. Some file engines need an initial connection, and browser storage can be cleared.
Does it work on mobile?
Yes — touch-friendly, one-tap download, adaptive workers for weak devices.
How do you make money?
Ads may appear only after configuration and the required consent signal. No paywall or fake download buttons.
Guides
Unix time and why leap seconds are weird · Business-days math across holidays · Pomodoro that sticks: intervals that work · DST transitions without surprises · Deadlines you can take anywhere — practical, original explainers with examples.